MCQ
Light is an electromagnetic wave. Its speed in vacuum is given by the expression
- A$\sqrt{\mu_0 \varepsilon_0}$
- B$\sqrt{\frac{\mu_0}{\varepsilon_0}}$
- C$\sqrt{\frac{E_0}{\mu_0}}$
- ✓$\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$
✓
Answer
Correct option: D.
$\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$
$\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A barometer kept in an elevator accelerating upward reads 76cm. The air pressure in the elevator is
-
76cm.
-
< 76cm.
-
> 76cm.
-
zero.
A capacitor of capacity $C$ is connected with a battery of potential $V$ in parallel. The distance between its plates is reduced to half at once, assuming that the charge remains the same. Then to charge the capacitance upto the potential $V$ again, the energy given by the battery will be
→1 volt = ?
When the current changes from +2A to -2A in 0.05 second, an e.m.f. of 8V is induced in a coil. The coefficient of self-induction of the coil is:
The temperature of the cold junction of thermo$-$couple is $0^{\circ} \mathrm{C}$ and the temperature of hot junction is $\mathrm{T}^{\circ} \mathrm{C}$. The $e.m.f.$ is $\mathrm{E}=16 \mathrm{~T}-0.04$ $\mathrm{T}^2 \mu$ volts. The temperature of inversion is
→1: Primary waves can travel in all directions in an ether
2: Secondary waves can travel only in backward in an ether
2: Secondary waves can travel only in backward in an ether
Identify the correct options:
Which of the following is the fusion reaction
A proton, a deuteron and an α particle are accelerated through same potential difference and then they enter in a normal uniform magnetic field, the ratio of their kinetic energies will be:
Calculate the inductance of a unit length of a double tape line as shown in figure. The tapes are separated by a distance h which is considerably less than their width b.
